Flexible Electrostatic Energy Harvester Driven by Cyclic Eye Tear Wetting and Dewetting

Pourshaban, Erfan; Karkhanis, Mohit; Deshpande, Adwait; Banerjee, Aishwaryadev; Ghosh, Chayanjit; Kim, Hanseup; Mastrangelo, Carlos H.

doi:10.1109/fleps51544.2021.9469729

Cited by 8 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One can measure the distance by measuring the vergence angle θV(u) between the observer's eyes, as shown in Figure , u >> IPD (5) where IPD is the inter-pupillary distance, ≈60 mm. In [27], a low-power, quad-scleral coil-based approach was developed for vergence angle detection. Here a pair of coils were placed on each eye.…”

Section: Distance Sensing From Eye Vergence Triangulatonmentioning

confidence: 99%

Ultralow Power On-the-Eye Vergence and Distance Sensing Through Differential Magnetometry

et al. 2023

Self Cite

View full text Add to dashboard Cite

We demonstrate the realization of a very low energy, on-the-eye vergence-type distance ranger based on sensing of a locally-uniform vector field, specifically the earth's magnetic field. This ranging method is passive, only requiring measurement of the magnetic field vector at both eyeballs utilizing magnetometer chips placed on the eye scleral regions. The eye vergence angle and range distance are calculated from these two vector quantities. The method can obtain a range reading with as little as 118 nJ of energy consumed per eye for 3.3V and 50 nJ when operated at 1.9V. This method is thus suitable for applications where energy storage is very limited such as in smart contacts vision correcting microsystems.

show abstract

Section: Distance Sensing From Eye Vergence Triangulatonmentioning

confidence: 99%

Ultralow Power On-the-Eye Vergence and Distance Sensing Through Differential Magnetometry

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, due to the limited available area on the SCL, the reading range (<10 cm) and the power output of the wireless power transfer are too low . Furthermore, our group already showed the possibility of converting the mechanical motion of eye blinking to electricity through the design and fabrication of two different types of electrostatic generators. , Electrostatic generators operate based on the capacitance gradient (Δ C ). , Hence, the device’s surface should be electrically charged to enhance the Δ C . An external charging source is not an appropriate option because it requires a separate power source always connected to the harvester.…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, the urgent need to develop a sustainable power supply for SCLs is recognized more than ever. Conventional Li-ion batteries, , radio power scavenging, and electrostatic generators , were already reported as the proposed strategies to supply power to SCLs. However, all these methods suffer from serious shortcomings, which make them unsuitable for the practical realization of SCLs.…”

Section: Introductionmentioning

confidence: 99%

“… 13 Furthermore, our group already showed the possibility of converting the mechanical motion of eye blinking to electricity through the design and fabrication of two different types of electrostatic generators. 11 , 12 Electrostatic generators operate based on the capacitance gradient (Δ C ). 14 , 15 Hence, the device’s surface should be electrically charged to enhance the Δ C .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flexible and Semi-Transparent Silicon Solar Cells as a Power Supply to Smart Contact Lenses

Pourshaban

Banerjee

Deshpande

et al. 2022

ACS Appl. Electron. Mater.

Self Cite

View full text Add to dashboard Cite

Supplying electric power to wearable IoT devices, particularly smart contact lenses (SCLs), is one of the main obstacles to widespread adoption and commercialization. In the present study, we have successfully designed, fabricated, and characterized semi-transparent, self-supported, and flexible single crystalline silicon solar cells using a single-sided micromachining procedure. Optical, mechanical, and electrical simulations, together with the practical measurements, verify the application of our developed solar cells to be mounted on a limitedfootprint and flexible SCL. The 15 μm-thick silicon solar cells conformally fit on a dome-shaped contact lens (ROC = 8 mm) without any mechanical and electrical degradation. This homojunction photovoltaic device containing an array of microholes exhibits a V oc , J sc , and maximum power density of 504 mV, 6.48 mA cm −2 , and 1.67 mW cm −2 , respectively, at 25% visible light transparency under an AM1.5 one sun condition. Furthermore, the measurements were conducted under low-intensity indoor light conditions and resulted in a maximum power output of 25 and 42 μW cm −2 for the 50 and 25% transparent solar cells, respectively.

show abstract

“…The available energy in the far field depends on the harvesting device's location and surroundings. Kinetic harvesters convert motions or vibrations into electrical energy via electromagnetic [13][14][15], electrostatic [16][17][18][19][20] or piezoelectric [21][22][23] transduction methods [1]. Electromagnetic (EM) harvesters consist of magnets and coils.…”

Section: Introductionmentioning

confidence: 99%

A Review on Kinetic Energy Harvesting with Focus on 3D Printed Electromagnetic Vibration Harvesters

et al. 2021

View full text Add to dashboard Cite

The increasing amount of Internet of Things (IoT) devices and wearables require a reliable energy source. Energy harvesting can power these devices without changing batteries. Three-dimensional printing allows us to manufacture tailored harvesting devices in an easy and fast way. This paper presents the development of hybrid and non-hybrid 3D printed electromagnetic vibration energy harvesters. Various harvesting approaches, their utilised geometry, functional principle, power output and the applied printing processes are shown. The gathered harvesters are analysed, challenges examined and research gaps in the field identified. The advantages and challenges of 3D printing harvesters are discussed. Reported applications and strategies to improve the performance of printed harvesting devices are presented.

show abstract

Flexible Electrostatic Energy Harvester Driven by Cyclic Eye Tear Wetting and Dewetting

Cited by 8 publications

References 15 publications

Ultralow Power On-the-Eye Vergence and Distance Sensing Through Differential Magnetometry

Ultralow Power On-the-Eye Vergence and Distance Sensing Through Differential Magnetometry

Flexible and Semi-Transparent Silicon Solar Cells as a Power Supply to Smart Contact Lenses

A Review on Kinetic Energy Harvesting with Focus on 3D Printed Electromagnetic Vibration Harvesters

Contact Info

Product

Resources

About